(296c) V2O5 Network Structure As Cathode for Lithium Ion Batteries
V2O5 has been vigorously investigated as an electrode material because of its high output voltage, and low cost, and high capacity compared to most commercial cathode materials, including LiFePO4, LiMn2O4, and LiCoO2. The unique crystal structure which is formed by the stacking of V2O5 layers makes V2O5 a special host for the reversible insertion and extraction of lithium ions. Many works has been devoted to improve the performance of V2O5, including making V2O5/carbon matrix composite, V2O5 porous structure, and nanostructures, etc.
In this work, we report a V2O5 network structure which is synthesized by a polymer-assisted chemical solution method. This V2O5 network structure delivers high and stable capacity of around 300, 200, and 120 mAh/g at current densities of 100, 400, and 800 mA/g after 50 cycles, respectively, which demonstrated an excellent stability and rate capability. The capacity and rate capability is better than most reported non-carbonaceous V2O5 structure. The high performance of the network structure comes from the unique two-dimensional network which bridges different length scales from the nanoscale to the micro/macro scale.